By clicking the following link within Internet Explorer on a Microsoft Windows machine, you should be able to log-in to the FTP server with your username and password in a regular web browser window: ftp://allenprecisionftp.com/

If you're using a Macintosh or are unable to connect using the link above, you can choose from any available FTP software. Some options available that will work are:

For Windows-based computers:
SmartFTP: http://www.smartftp.com/
CuteFTP: http://www.globalscape.com/cuteftp/

For Macintosh computers:
Fetch: http://www.fetchsoftworks.com
CuteFTP for Mac: http://www.globalscape.com/cuteftpmac/
Interarchy: http://www.interarchy.com/main/